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Plant an acorn in a large pot with 100 kg of dry soil. Water daily for 5 years. After 5 years, the tree has a mass of 70 kg. The soil is carefully recovered, dried and weighed. How much soil remains?A. About 130 kgB. About 100 kgC. About 70 kgD. About 50 kgE. About 30 kg

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